Ground-Water Information Center Water Quality Report Site Name: O'ROURKE AND WILLIAMS, RORY CLARA AND SARA  Report Date: 4/29/2024 Compare to Water Quality Standards Location Information Sample Id/Site Id: 255742 / 317196 Sample Date: 6/11/2023 3:10:00 PM Location (TRS): 02S 06E 36 CCCC Agency/Sampler: MBMG / ENGLISH, ALAN Latitude/Longitude: 45° 36' 47" N 110° 56' 16" W Field Number: 317196 Datum: WGS84 Lab Date: 7/26/2023 8:19:54 AM Altitude: Lab/Analyst: MBMG / TIMMER, JACKIE County/State: GALLATIN / MT Sample Method/Handling: PUMPED / ru:1 ra:0 fu:2 fa:2 Site Type: WELL Procedure Type: DISSOLVED Geology: 217KOTN Total Depth (ft): 205 USGS 7.5' Quad: SWL-MP (ft): 83.6 PWS Id: Depth Water Enters (ft): 125 Project: Major Ion Results mg/L meq/L mg/L meq/L Calcium (Ca) 66.190 3.303 Bicarbonate (HCO3) 393.650 6.452 Magnesium (Mg) 29.210 2.404 Carbonate (CO3) 0.000 0.000 Sodium (Na) 13.780 0.599 Chloride (Cl) 1.100 0.031 Potassium (K) 5.410 0.138 Sulfate (SO4) 20.930 0.436 Iron (Fe) 0.378 0.014 Nitrate (as N) <0.010 U 0.000 Manganese (Mn) 0.041 J 0.000 Fluoride (F) 0.320 0.017 Silica (SiO2) 8.310 Orthophosphate (as P) <0.020 U 0.000 Total Cations 6.478 Total Anions 6.936 Trace Element Results (µg/L) Aluminum (Al): <2.000 U Cesium (Cs): <0.100 U Molybdenum (Mo): 0.310 J Strontium (Sr): 651.340 Antimony (Sb): <0.100 U Chromium (Cr): <0.100 U Nickel (Ni): <0.100 U Thallium (Tl): <0.100 U Arsenic (As): <0.100 U Cobalt (Co): <0.100 U Niobium (Nb): <0.100 U Thorium (Th): <0.100 U Barium (Ba): 77.000 Copper (Cu): <0.500 U Neodymium (Nd): <0.100 U Tin (Sn): <0.100 U Beryllium (Be): <0.100 U Gallium (Ga): 2.240 Palladium (Pd): 0.460 J Titanium (Ti): <0.100 U Boron (B): 51.180 Lanthanum (La): <0.100 U Praseodymium (Pr): <0.100 U Tungsten (W): <0.100 U Bromide (Br): <10.000 U Lead (Pb): <0.060 U Rubidium (Rb): 3.590 Uranium (U): <0.100 U Cadmium (Cd): <0.100 U Lithium (Li): 49.880 Silver (Ag): <0.100 U Vanadium (V): <0.100 U Cerium (Ce): <0.100 U Mercury (Hg): NR Selenium (Se): <0.100 U Zinc (Zn): 22.580 Zirconium (Zr): <0.100 U Field Chemistry and Other Analytical Results **Total Dissolved Solids (mg/L): 338.51 Field Hardness as CaCO3 (mg/L): NR Ammonia (mg/L): NR **Sum of Diss. Constituents (mg/L): 538.42 Hardness as CaCO3: 285.5 T.P. Hydrocarbons (µg/L): NR Field Conductivity (µmhos): 535 Field Alkalinity as CaCO3 (mg/L): NR PCP (µg/L): NR Lab Conductivity (µmhos): 638.41 Alkalinity as CaCO3 (mg/L): 323.15 Phosphorus, TD (mg/L): <0.030 U Field pH: 7.45 Ryznar Stability Index: 7.060 Field Nitrate (mg/L): NR Lab pH: 7.28 Sodium Adsorption Ratio: 0.3605 Field Dissolved O2 (mg/L): 0.320 Water Temp (°C): 6.8 Langlier Saturation Index: 0.110 Field Chloride (mg/L): NR Air Temp (°C): 20 Nitrite (mg/L as N): <0.010 U Field Redox (mV): -41.6 Nitrate + Nitrite (mg/L as N) <0.200 U Hydroxide (mg/L as OH): 0.000 Lab, Dissolved Organic Carbon (mg/L): NR Total Kjeldahl Nitrogen (mg/L as N) NR Lab, Dissolved Inorganic Carbon (mg/L): NR Lab, Total Organic Carbon (mg/L): NR Total Nitrogen (mg/L as N) NR Acidity to 4.5 (mg/L CaCO3) NR Acidity to 8.3 (mg/L CaCO3) NR As(III) (ug/L) NR As(V) (ug/L) NR Total Susp Solids (mg/L) NR Notes Sample Condition: CLEAR Field Remarks: Lab Remarks:

Explanation: mg/L = milligrams per Liter; µg/L = micrograms per Liter; ft = feet; NR = No Reading in GWIC Qualifiers: J = Estimated quantity above detection limit but below reporting limit; P = Preserved sample; S = Method of standard additions; U = Undetected quantity below detection limit; * = Duplicate analysis not within control limits; ** = Sum of Dissolved Constituents is the sum of major cations (Na, Ca, K, Mg, Mn, Fe) and anions (HCO3, CO3, SO4, Cl, SiO2, NO3, F) in mg/L. Total Dissolved Solids is reported as equivalent weight of evaporation residue. Disclaimer These data represent the contents of the GWIC databases at the Montana Bureau of Mines and Geology at the time and date of the retrieval. The information is considered unpublished and is subject to correction and review on a daily basis. The Bureau warrants the accurate transmission of the data to the original end user. Retransmission of the data to other users is discouraged and the Bureau claims no responsibility if the material is retransmitted.